УДК 541.182 B.G. Kukharenko INDIRECT IDENTIFICATION OF LOW-PRESSURE COMPRESSOR BLADE FLUTTER WITH OSCILLATION RECORD PREPROCESSING IN USE The paper relates to study of unstable oscillations due to a low-pressure axial compressor blade flutter. <...> As informative parameters, which determine the time-evolving unstable oscillations of a relatively stable frequency spectrum, just damping ratios related to the blade natural frequencies are in use. <...> As the oscillation record signal-to noise ratio decreases, an error in determining the blade natural frequencies is lower than an error in determining respective damping ratios. <...> As shown, linear pre-filtering the unstable oscillation records, their decimating, and noise-reducing by the Discrete Stationary Wavelet Transform with thresholding wavelet coefficients provides that the damping ratios determined by the Prony method are stable from computations point of view. <...> It gives an opportunity to identify the compressor blade flutter indirectly with air-flow pressure pulsation and compressor body vibration records in use. <...> A study review of multi-stage compressor blade flutter induced by an air-flow is presented in [1]. <...> In present paper a blade flutter in three-stage axial low-pressure compressor is under study. <...> The engine consists of fan and this three-stage axial low-pressure compressor (cold part), axial high-pressure compressor, combustion chamber and axial high-pressure turbine (hot part), and axial low-pressure turbine (cold part) [2]. <...> The tree-stage axial low-pressure compressor (fan-like) is tested separately under a constant rotation frequency. <...> In contrast to paper [2], both the compressor blade oscillation records, synchronous airflow pressure pulsation records and compressor body vibration records are analyzed. <...> The induced blade oscillation frequency spectra are different, and the blade bending frequency isn’t detected distinctly enough in the frequency spectra [3]. <...> Blade collective oscillations relate to instability of blade bending mode. <...> As the stochastic oscillations induced by air-elastic forces self-organize in circumferential blade collective modes of bending frequency, the bending (natural) frequency is detected exactly enough in all blade oscillation records. <...> So, an existence of dominant bending frequency in various blade oscillation spectra demonstrates their self-organization in form of the blade collective mode. <...> The bladed compressor wheel assembly <...>